Controlling mechanism for furnace firing equipment



arch 1953 A. F. SEIBEL 2,825,546

CONTROLLING MECHANISM FOR FURNACE FIRING EQUIPMENT Filed Sept. 7, 1954 6 Sheets-Sheet 1 CO MBUSTION AI R SOURCE.

. IE "26 Comausnoru- 39 Ana Common. Z (Bo'fh Burners) OIL CONTROL (Bofh Burners) BURNER MOUNTING AT OTHER END OF FURNACE Is SIMILAR IP I I I"? I I I I I NOTE I I I I I l 23- '22 I 25 2 2] I}! 24 2? I 26' ATTORNEY CONTROLLING MECHANISM FOR FURNACE FIRING EQUIPMENT Filed Sept. 7, 1954 March 4, 1958 A. F. SEIBEL 6 Sheets-Sheet I INVENTOR. H/fred F Je/be/ ii 5: 1 x

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ATTORNEYS March 4, 1958 A. F. SEIBELZ CONTROLLING MECHANISM FOR FURNACE FIRING: EQUIPMENT Filed Sept. 7, 1954 6 Sheets-Sheet 3 FIEV aAcK y /g IN VENT 0R Alfred f. 5e/be/ HITORNEY March 4, 1958 A. F. SEIBEL CONTROLLING MECHANISM FOR FURNACE FIRING EQUIPMENT 6 Sheets-Sheet 4 Filed Sept. 7 1954 INVENTOR. Alfred Fig/b e/ ATTORNEY A. F. SEIBEL CONTROLLING MECHANISM FOR FURNACE FIRING EQUIPME Filed Sept. 7. 1954 March 4, 1958 6 Sheets-Shet 5 m n e P INVENTOR. A/fre'a fJE/be/ BY March 4, 1958 A. F. SEIBEL 2,825,546

CONTROLLING MECHANISM FOR FURNACE FIRING EQUIPMENT Filed Sept. 7, 1954 I 6 Sheets-Sheet 6 FIEXV ,I INVENTOR. Alfred FJg/be/ WWW FI TORNEY United States Patent GONTROLLING MECHANISM non FURNACE 'FIRING EQUIPMENT Al dF- Selhel, T l Qhi Application September 7, "1954, Serial No. 454,509

7 Claims. (Cl. 263-40) This invention relates to oil or other fuel firing equipment for industrial furnaces, particularly adapted for treating metal such as used in drop forging and the like. lheiuvention {is particularly concerned with the fire pro- (Klein g equipment therefor, including the proper shape, configuration end construction of the furnace itself and the employment ,of a special type of burner unit such as disclosed in v rny copending application, Serial No.

' 393,633, new Patent No. 2,764,455, the present inventhereby greatly increasing the overall efficiency in use and 7 economy in the amount of fuel employed.

Further objects and advantages are within the .scope of the invention such as relate to the arrangement, operation and function of the related elements of the structure, to 'various details of construction and to combinations 'of .parts, elements per se, and to economies of manufacture and numerous other features as will be apparent from a consideration .of the specification and drawings of a form .of the invention, which may be preferred, in which:

-Figure'I is an end elevation of my improved furnace;

Figure 11 is a rear elevation of the same;

Figure III is a section taken on the line III-411 of Figur'eI;

Figure IV is a section taken on the line IV- IV of Figure I;

Figure V is a horizontal section of the furnace showing diagrammatically the action of the flame in the fire box;

:Figure is .a sectional elevation of the same taken on the line'VI VI of Figure V;

Figure VII is an elevation, partly in section, of the remote control head for controlling the fuel supply and combustion air lines;

Figure VIII is a section taken on the line VIII-VIII of Figure VII;

Figure IX is a front elevation of the control head shown in Figure VII;

Figure X is a section taken on the line XX of Figr I;

Figure XI is an elevation, partly in section, of the bal ancing valve used to control the branch lines of the fuel upp y;

Figure XII is a section'taken on the line XIIXII of Fig I;

E gu e is a sve se sest en taken o t e line zsqllrXlll ef stur sh i t e ene ns alv in full ppen positipn;

Figure XIV is a similar view showing the balancing I 2 va v in P9 i l t lim t th fle l -0 0. t bra c lines;

Figure v is a simila y sh wing th a in valve i pes t e te-een e supp y 11 r-t e b n h ue line; A

Figure XVI is asi nilartransverse .viewpf the valve with the supply .to the hranch linesnentirelycut voff;

Fi u e V s e e e i l n-en the line of Figure XIV;

u e.X l s a el e e pa y in s t on o the automatic control valve -between the high pressure line and the fuel line;

u e XI 215 3 se t h taken e the lin X XIX ref vF gu XV I ens Figure XX is e seetieh t ken t n t e lin X X re .F s eXVI-II- In th PIQSQR! embodim n o y inven i il u tr ted h ein, the i h ns e in ud s the nflts de am rk w th h u i e e heat ng l hamhe il us r ted at Th s 9 391 353?l ii mpq lidlo plbu l z p th s ita le efractory material to withstand high temperatures and may he formed ofsuitahle furnace bricks used for this .purpose. The particular firing charnber ,of my invention illustrated herein has i rectangular floor 11, ve rtica1 left end wall I land right end wall 13,,a rear Wall 14and a front 15,the latter provided Withopenings 16 an d 17 through which the metal or metal pieces ,to be heated are inserted and removed fromthe interior of the furnace was is customary with the metal pieces restingspn the fioonduriug heating. Th nae .1 is Pr ided w th relat v y o he w n .18 ea s ed rom neend .wall to t em e s sh w i F u e Y and VI: The u nace .ehamher as indiat d eh ye i leeeted Wi h nahd e d by u r u ing metal casing or metallic framework M19, the furnace its ein spaced eheve th d e th bu l ng s show in ,E sh e I.- Ihi fac at in t e hd ewe meta i es y t e fu na op a r stands n t e liver ea t v. i n ss therein, he e s w s ested in heat 9 th furh ee- By m r h ehtien I ,previ e pa f pp s ely v ranged special burner pn'its 20 and 21, unit 20 located in one end well 12 as at the left, toward the front wall nd e ethe bu n 21 pe e e i e other end W towa d th rea Wa in th pa ticular installat e he e shewn- In ea h cas i p e j e a speci burner block of suitable furnaee wall material constructed with a frusto-conical-sbelle? passage therethrough as shown. The @Xes of these passages through the burner block for each burner unit 20 and p21 are positioned at an angle o heet S'deg ees e t ea y t t e erizen as h wn by i 20A F ure VI andat 29A in Fig re .V and d e e t wa d 'the ofrhnt b .ebent five "d Like- W se the othe burner l ck f ner .21, as sh n b shin 2 A n F ure VI, i Po ition d at ut five de rees ve t cal y ro the he i ehte end a s n in Figure V, the axis of this frustorejonicgl opening through that, burner block for burner 21 is directed rearwardly by abou .five d grees sshown y l ne 21 i Figure hi s e e neh e p ra e w th th speci settin and aiming o t b ne units 20 a as he n s f rth. Each burner unit is positioned abovethe floor 12 by a p e as i h n Fi ure I, .rl pensl t up t s ze the p t l r furnace which ca a commodate vari us sizes ef t l p c t be nserted nto th fu nace o be heat d- A stat above t ese b rn s ar o th ec l type il u tra ed in .my e p dihg pp i e ia Ne- $39.3 .3.3, t ed Ney tnher 123 1 9 3- A peei is a ehm nvention is i prope y leeee n end s ml sfseid ihurn rs 29 vand 21 a su h i ng e that the flames therefrom do not cross each other but di c lens na ow flames s ing there rom upwa y 's'etting 'ot the burner units; In conjunction w th is ipply n p 36 "one flame"preferably-contacting against the front ivall 7 near the opposite end and ceiling, and the other against the'rear wall,'as indicatedqin'Figure VI. In this way, I prov de, means to form taturbulent'extremely hot mass "'of heating niediaXsee Figures V and VI') and uniformly distribute the same throughou't the entire interioi of the- 'fi a t jh eh y 'wrti em s i fif th fla e r su te mg in'forcing the heating media uponyarou'nd and be.-

' tvveenlthe metal pieces'located on the floor-7.111;; I hu's, 'I provide two elongated flames projected fromi oppjosite endsot'the jfurnacesdirec ted longitudinally and'upwardly, V

' :s'aid fiafmes being parallelin ahorizontalplanejwith one 16and17inthe frontwall of the furnace."v l' 'f 'Qne means for supporting the burners 20'and' 121,011 'the furnace consists of a pair of anglesupports -22 'and23 welded or otherwise secured to thevfurnace, a pair on each opposite; end thereoffeachfhaving ,vertical slots-24f and 25 in the yerticaltouter' flanges 'of saidusuppb'rts'ib whichangle brackets 26 and 27 may .be adjusted-and 7 set inl'a'. desired position 'by's'uitable locking bolt s'an'd nutsas showng,g These braclgets':26 and f2 7 also ha've 1 horizontalaslotstherein, as sliowngu'so th'at ,said adjusting bolts and nuts Jock said supports {in both yerfical, and f horizontal position. A pivoted circular baselmemb'er or cradle 28, one carrying each separate burner tunit 20t or v is pivoted by cap tscrew's'2 9 and 30; a s shown; to said bracl ets;26 and *27 (see Figure III); [By this construcrtion the longitudinal axis ofeach burner 20" and 21 ma be'tilted vertically at the desired and proper angle. In

order toswinghorizontallyand set in'position eachsof iburner imits 20 and 2 1. 'Byunloosening the capf screw portionthereof In fact, the heating massofflame and combustible'material completely enshrouds the metal and" extends to, ifnot slightly outwardly through th' openings (from the bottom, s id unitswma'y be rotated-horizonltally and upon screwing up on capscr ew 31, the-head 331 thereof locks v the burner ,units inwdesiredwposition in the can screws 29'and 30, .thez burner-unitsmay be ;givenfandlocked in the: proper vertical anglel rIn'this horizontally. ,lBy properly setting the other settof pivots mannerithe burner may beainiedginithisparticular-type t foftinstallation as' desired tofproiect a longfi'ame from each burner from opposite 'endsof the furnaceastsitated above.

ntain the correct. 'angul' roregaiig japaaa ima e the :rately controlling and setting iu fixed position sfi of the 5 7 "various supply connections ofjheffiuids used in; my equip- "Imam; yvithfcertain definite and accurate adjustable'con- V 'i ,trolsltherefoij'as will hereinafter more j fully appear,- in-' i '7 iclu'ding fan interconnected I automatic; shut-off: valve for the fuel ilineffforfjsafety ur oses; 7 r ""a s'uit'able soujrceia fueLYst ich a I liighpressure1airbr steamsmixinggn ecting and vaporizling umedia'rtherefor through thefjinlelt supply-linei35g as f 7 a p V V va l ve"37 to'beadjusted'and settln fixed;

'T "shov vn, in ;Figures XLXVHfdetaildy wsg of no 75 construction. 7 For example, the-valve 37' 'il supply line: 34,: a

ell ames-kw r'essure or icornbustiofiyjai i inain' inlet en provide; in addition 1 V I also provide suitable couplings,60 forattachi stub shafts to the s'haft sleading to theffuelfialtv fand'the combustionflair valve 62ff-ln;thistrnanner; I Zpositions of both these valvestrnaybe'accurately 'set gand Referring to the overall'ar "as shownjin Figure II, thelinainifuelfsupply pip line;

a liminary mainline ;valv-f6;and througliidoumward tending pipe Ggi, }the fuel supplyis 'conneeted'toil Thus, I pr ovide from V 42 formed witha boss 43, the' Wall and bosshe g I -u asiat 44 to;receive theen'd of a stub sha ft i 1 A graduated dial member tfi-is fixedlyi attache to idial memberis also hqred'as' at '47 ;to rece V jthe stub shaftAS, the'sarnebeing fullyirotatable-inthe V j bores of the bosseiand the diaLgfMountedonfthe shaft j t 45' and tilted there-to as *byfSet scrW' 48; l proiiide fthe t. jha'ndlelandflocking headsjor means 38"a'n'd 3 9fthese' eirig-t identical foreach-n1e1riber38 and 39 and, as particularly 7 'shown in Figure VIIIfaremade'up ofa'ceriti'al biiss fiQ 1 Y 1 wings, 52, these'rbeing adapted to selectiv accurate control and regulation of the high stream or other vaporizing media-(supply line '35-)a special balancing valve-37 for'equalizing fuelis upply to' both burners as well as a 'remotecontrol at the front of the furnace for the fuelfor both burners. I'also provide hereinafter be more fully '.set forthgm a In order to providea very accuratelysettable andcon- Q trollabl'e 'r'neans constituting =thesetwo remotejcontrol heads or adjustable meansin the'h'andles 38 and/ '39, I 7

. H t W V V o a satlf show, ,infFigures Yli' to X,- th de construction the'refpnff To this end," l p qvidei mambe t tachment tothe frameworh pffthe furnce 7 y m bolts 41. The member 40 is' p 'rovided witl1{a "member 40," or may be cast integ'ral "there around shaft 45,1ari extending arm and 51h 'tion '51. The boss"49=is]also providedjaui't hsurface S3cnthe orack'etl tfiiipon rlot'tio '54'into extreme positions-in either directi I provide in the'handleSl a lockingfinea s p 7 g 'boi'e 55, partially threaded as:at.56-to i'eceive=a;scre

'57 having a knurl edifheadySSpAtwoodfiberforlother suitable contactrnemb'er59ismounted inftheloweriendbf the bore 55 :againsttheinner'end of the screw 7 adapted to be moved thereby; -As tparticularlyshown 'Figui'esVIII and XI, I 'rnount the' centeriofthefhandle V member 51 dir'ectly over -the' periphery-of: thefixedmial" 4 6, and in such a manner that-the contactmemberfiimay mar-1 be moy'ed'down by' the; screw 57 to contact the' circu *ential surface of the dial tmernherl46, whereby; the handle member; 51 in any selected positio locked; by the remote :c o ntrolyh v e'ads and control-means designated as 38 and 39.; 7 p rangenient -more 1 34 located,"in thisparticularcnibodimentgiat th l" 'upperright hand-corneriofthe,furnaceQorQ sited, in Various'fother installatio'ns, 'garid I prof/1 controlled and set by; remotely i positione ferred tofsupra M'oreover,; I provide in ain' oil :v'alve filiandLthe ha (1 head-"3 'fue su La c described. 7 Hence, a'pipe I cOnnects the sarne' wi ammin valve 37= f roniivhichl-t\vo' march, 15 e li and167 conueotito'the burner, units 2 0' and-'2 1 I 51 connectors 6 6 arid67, as suewns v Fo'r"one special embodiment o 'a is tahl lock Y provided with a frusto-conical bore 69 and connected with laterally extending ports 70 and 71, The lower part of the casing 68 is threaded to receive a short nipple 72 which is also threaded as at 73 to receive the end of the fuel supply pipe 65. In the bore 69, I mount a rotatable valve plug 74 with a vertically extending stem 75 passing through an opening 76 in the 'top of the casing 63, said stem being reduced in diameter as at 77 for suitable attachment to a valve operating handle 78.

The valve plug 74 has a central bore 79 in communication through the nipple 72 with the fuel supply pipe 65 and is also provided with lateral tear drop shaped ports 89 and 81 in communication with the central bore 79 and adapted to register with the ports 70 and 71 in the casing 68 in various positions as required in the operation of the valve 37. The action of the ports 80 and 8 1 is illustrated in the enlarged sections, Figures XIILXVI, while the shape of the ports is shown in the vertical section, Figure XVII. It will be noted that the ports 80 and 31 are not centrally bored with reference to the valve plug 74, but are offset from the center line to permit the adjustments as shown iuFigures XIV and XV, where is will be seen that while one port remains fully open, the other can be infinitely varied in port area, the tear drop shape of the ports enabling the port areas to be reduced to an extremely small opening at the point of the tear drop, which is directed toward the center of the valve, as shown in Figures XI and XVII.

It will thus be seen that an extremely accurate balanced relationship can be elfected between the amounts of fuel admitted through the valve 37 to the pipes 66 and 67 and thence to the opposite burner units and 21, this relationship being set as required to produce the maximum eficienc'y for use in my improved furnace and may be varied for different operating requirements.

Figure II also shows the high pressure air supply system, as indicated above, may involve thefus'e of other media such as steam, gas, etc. Thus, I provide the main high pressure inlet air line 35, a transverse line "82 at the rear of the furnace 10, said line 82 having a suitable cutoff valve 83, filter 84, pressure regulator 85 and gage 86 therein, whereby the high pressure media supplied may be controlled and set for a desired requirement and manitained fixed at about 45 pounds pressure for certain desirable installations. The transverse pipe 82 is connected to the downwardly extending vertical line 87 with branches for the high compression air, one branch 88 for burner unit 20 and the other branch 89 for unit 21, both' connected to the burner units through flexible connectors similar to the fuel connectors 66' and 67'.

As shown in Figure II, I also provide in the present invention, means for intercontrolling the action of the high pressure air or steam line with the supply of fuel to the burners so that unless there is a proper pressure.

in the supply of high pressure air orsteam u's'ed,"no oil or fuel will be supplied to my firing equipment. 'Ifhus, between the high pressure air line 82 and the fuel (oil) line 65, l interpose such an automatic control in'the automatic oil shut off valve 90 connected to be controlled by the pressure in line 82 through pipe 91. The details of this valve 90 are shown in Figures XVIII to XX, where it will be seen that connected with the pipe 91 is a bellows 92 so that the pressure within the same corresponds to the pressure adjacent the gage in the high pressure supply line 82. Connected with this bellows so as to be operated thereby is a depending pin 93 adapted to contact the upper end of a valve stem 94. This valve stem extends downwardly into the valve housing 95 and carries a valve 96 adapted to seat against a seat v 97 in the valve housing 95. A coil spring 98 is positioned as shown in the bottom of the valve to constantly urge the valve into seating position.

It will be seen that the passages 99 and 10,0 connect on opposite sides of the fuelzsupply line 65 and that by a the passages indicated inside the housing, the valve 96 controls the passage of fuel therethrough. If pressure in the high pressure supply line $2'falls below a predetermined minimum, thespring 98 will close the valve 96, since the pressure in the bellows 92 derived from'the high pressure supply line 82 holds the valve open by the pin 93, all contacting the end of the valve stem 94.

In operation, the balancing valve 37 is properly adjusted and set for etficient operation for a given furnace. The same applies to valve 83 for the high pressure air, steam, or other media used herewith. However, the two regulating heads 38. and 39, I provide for controlling the fuel supply and supply of combustion medium actually entering each burner unit 20 and 21 as may be necessary for best operation of the furnace by the operator and these two control heads 38 and 39 are, as stated above, located adjacent the furnace openings 16 and 17 so that the operator may readily adjust the fire within the furnace tn suit the actual operating conditions prevalent, and lock the same temporarily in the correct position. For satisfactory operations, I have found for certain furnaces that a p ur o 40 to 5 unds or h hi P ur n has been desirable and clogging of the passages avpided. The air or other combustion medium I have operated under bou 5 p nd Pres e I is ap ha ith he op of t enti n, d fic n and fiereat arran m a be mad other than is herein disclosed, and the present disclosure is illustrative merely, theinvention comprehending all variations thereof,

What I 'claim is:

1- n a at n rnac e hea et to high t mp ra ur s n hirl; ean are Provide for ns r m a to be heated and removing the heated metal therefrom, a combu tion h m e h v an e n t oo upright side and end walls and a ceiling arched in a longitudinal d re i n sa d hamb avin a refractory inner surface; a pair of opposed burner units, one located adjacent each opposite end wall of said combustion chamber, burner blocks having openings therethrough located in said end walls of said chamber, said opposed burner units positioned on said furnace adjacent said burner blocks and aimed to inject a turbulent uniformly distributed heating flame into said chamber around said metal to be heated, said flame passing through said burner blocks, means to supply fuel and combustion supporting gaseous medium to said burner units to form said flame; single manually operable valve means to set and simultaneously control the supply of fuel to both burner units; means separate from said fuel valve means to simultaneously control supply of said combustion supporting gaseous medium to both said units; and means to adjust said burner units whereby each directs an elongated flame into said chamber from opposite ends, to contact the adjacent side walls adjacent the opposite end wall and near said arched ceiling whereby the heating media injected into said furnace isturbulently mixed and distributed onto and around said metal to be treated in said furnace producing a maximum uniform high temperature;

2 In a heating furnace for heating metal to high temperatures in which openings are provided for inserting and removing metal to be heated, a combustion chamber having arectangular floor, upright side and end walls and a ceiling arched in a longitudinal direction, said chamber having a refractory inner surface; a pair'of opposed burner units, one located adjacent each opposite end wall of said combustion chamber, said burners adapted to inject a heating flame into said chamber through inlet burner blocks located in said end walls; a main fuel supply pipe located adjacent a wall of said furnace; branch fuel supply pipes from said main fuel supply pipe to each burner unit; means to supply a combustion supporting gaseous medium to said burner units to form said flame; an adjustable balancing valve means to adjust and set the supply of fuel to each bnrner unit; meansto simultaneously control supply of said com- -bustion medium to both said unit s; means to adjust said line; manually'operable remote jcontrol heads foradjusting; 'byrner'unitshereby each directs an elongated flame into andt's'et'tingsaid last-mentioned valves; said heads'located i h'q f om opposite ends, to c ontact the adjacent V at the froiit ofjsaid furnace'adjacent said metal'insertion V sideyvall spaced from theopposite end wan and adjacent a V mearisiandseparate linkages extending bet e s d said arched ceiling whei-eby said flamesare 'turbul ently fi t0'Said'Va1V$- l a i 7 mixed to'produce'a maximum uniform high' temperature' 5. IIn'aV heati'ng'fumace for heatingmetal to high tem lihl u g hout saidheating portion of-said chamber; and P a ures';aj'conibustion chamber, havinga rectangular another fuel'control'valvelocated in said main fuel su p ply 1100 ide and end Walls and afceiling ar ched in ajlongitulinelto simultaneously control pas sage of fuelto both said dinal direction said chamber having a refractory inner branch pipe lines; a linkage for controlling-said last-men Surface, a'rpvail 0 PP d units; 0116 located f i honed valve and extending to theside of said furnace adent each opposite wall of said combustion chamber, said valve through said linkage.

' b 6 o furnace-openings; and a single handle loc d burner'sadapted to inject ahea'ting flame into S id chain-r 7, at the front of said furnace for regulating and setting said r through inletburnor lo located in said u w l a a t V a main fuelsupply pipe locatedadjacent the rear wall of or heating metal to'high t n i. said'furnac'mbranch' fuel supply pipes from said main'fuel:

3. In aeating furnace peraturesinwhKh openings are provided for inserting and supply pipe to'each burner unit; means'to control'the new .removingmetal to be heatedfa coriibustion chamber u through said main pp y line, and m a y. havingjam ecfangularl flo0r, upright 'side and end walls soitta'blo iu o r-a i g t uut' t and aa}ceili'n r" r'1 =;dii l il i difi l dig i m id of fuel received by 'eachburner from each of said branch t hainberhaving a refractory inner surface;' a pair Of'Opfuel pp y s' a' means p i 'a'c a e t u V posed bur'nergunit'sjbfild ted dj tk ch bp if 'in communication with said main fuel supply line iand 7 end wall 'of."s'aid fconibustion' chamber, saidzb'nfijrs ch of said branch lines; a manually rotatable andoset 1 adapted id "inject a heatinggflame into; said chamber table hollowvolve'plugrthereiu, carrying a p r fr' cen:

through inle t'burner blocks lociated in saidi endvvvalls; V tficanyrlocafed -d p p d P I saidrports'adfiptedi a ai rnain fuel supply pipe located adj ''enf all f id to register with the valve openin'gslinto said branch fuel I furnacejbrancjh fuel supply pipes 15m saidimain'fuel i w by fuel d m fuel, ne-i e ad: a

' tsupplyipipe'to eachbufrner unit; amanuallyfadjnst 'bb 'mitted to either or 'bo'th'ltof said branch linesgsaid tear}. and"settableibalancing valve-locatedfatithe union 'o f's'aid opape openings being p o p o lmaxi-oa 'iiiainfuel supply 'pipe' a'fijd aid'br in hjfflglf fimjljlpi g mum valveropening-intoieither of said'branch'lines, while said valve being adapted to control theiimdufitfofffiiel 39 pu g iIltO c b m y .6; a justed from I 7 jsuppliedto each'ofsaidburners througlisaidbranch pipes V Ze o to a HiaXimuma'mountQf" I j a {mm-said fu l'siip'ply ipes; midst-d supply a combustion V 6- In i g furnace for ea i g m t highi m 1 supporting gaseous nie'diu'mftov said buriiefuiiittdffoiin v *p'e ratu'res injwhic hrmeanslare provided for insertingmetal f '7 said lfia rneg me'ansjto simultaneously contrblsnf ly f 'to be heated andremo'ving theheatedQrnetaI therefrQm {V a j i lisaid"coiriliustionl mediumto fboth saidf unit'inie'd 'sQtozo 5a combustion mb h v g a rectangu nfloor," p: 7

' adjustjsaidlbu'rner unit'siwh'er'eby each'diie'cts'anelongated. "light, side audendjwallsiand a ceiling arched in ailongitw flafrie'intojsaid' hamber'iromopposite ends and c 'o ct 2 dinal direction;- said chambenlliaving' a' refractoryginner tlie.adjacntsidewall neai 'theopposite endi 'an dadja'cerit u a e; 'pa fioppo dburner:units dneldcaiefli g i 7 "said" archedfc'e'iling ivher'ebycjsaid fl ame s ar'elztu'rbiilently nt ach opposite end wall of s id m sti n h mber, ,mixed' ot' pi'oduc'e a maximum uniform high'tempe'ratiife 0 burner bl s located Said endfwalls of said 611 126 1 e 5 throughout said metal heating Tportion'bf saidfchiinber; Said PP i 1 units piisitidned adjacent (Said burner Q andgandther ifner controlivalv'e located *in, said :main fuel V s. n e of j turbulent f m y' r '7 supply line ,to ,control'passagehf fuellhrofighsaid'maiii tl'ibllted hatilrlg a a chamber a -s l f -ouslyfcoritrol supplyof said combustion fluid ifiboth saidfi a ls O L h'amber said opposed bulfiibi'lll t pp :d bra nch'pipe lines; a valve'insaidcombustioniiuid's "jpipetolbbth said hr anch '"pipe lines; a linkage for con- 1 metal to be heated,'said flarne passing throughgaid 'burher "trollingsaid last-mentionedflvalve' and extendingltofthe blocksmoaus to s pp y pr reo u n1 front side ofsaid furnace :adj acentthe furnace-openi fluid torsaidrebuvmef units; Val"e meanslto Set -r i l anda ls'ingleithandlejlocateda thefro'nt efjsaid jfur'na c {both the s pp y u an o p u c o oth; J for reg ulati'rig and setting- 'said valve'through said linkage; u m 7 PP Y a v ighv pj oj eu I a .J'Ifi a heating furnace f or h eatingmeta'l to highjfte'fiii m to. both :burl lerilm l 0 i1 td pressur peraturesiin; which'means.are provided for 'i nsei'fingjand 0 controllingjpassage between said high pressure line an'd removing metal toflbe heated," afcombustion 'chaniher 'Said n PP Yl i li h u l j Lhaying?airectangularlffloon'j upright sideflandij'endjwa-lls' l-c i n fF Q Q QBIY' EL 13 1353 1 co c djwi h and'a g lling archedfin a longitudinal direction, id said valve forcutt ng ofisaid rnaiu f lis pp yup u chamber haying ia'jreffactoryinnersurface;'apaifofop- I v of s 'p e h h p o o f o posed1burfierfunitsf'one"locatedf'adjacentach fopposite F a p ed t m o end 'wallf'qf said combustion, chamber; said burners j V -fI 1 g uruaot o h u me ;h i mr adapted to inject ia'iheajting flameiinto said chamber" f P i iIf w i' ihtm fl a PIO d insertigg m al through finletlburn erblocks located in, s'aidfencifwallsi I Heated" dn the hq me l s f m, s a main fu'el supply pipelocated adjacent the mi wan 10f Y a oo u io ho mbor h fi P qq lifi h j said furnace; branch fuel supply pipes from said main: olj eand Qnd all's'@fidififi archdsein jjlou tudi l a "'1 refuel supply pipe to eachiburneifunit; pipi'n g meansfto fl ai h m o h n -a; r ufirgs rfe t supply. d'cdm dsddn fluidto said burii11units-tolform: f p opp u erF sa uel te jasli q gacw 5i s'aid' fiameg an adjustable ibalancingwalve' toiadjustgthe"; opp tev swallofls oin t j a r,burn rsupply of fuel to both burner units; means; to simultane-r v o s av uaop n e fi o b' sted.iusa s F fnnits; means to' adjustrsaid burner units whe eby each ltion df i ifu'rna' j t' ri 'hl k i u (directs an elongatedflame" into said chamber-from opposite. I aimed f0 iujfi iia;tui lfi i il y d Si l ii ti fl ends, to contacfthe adjacent side ,wail spaceid from th'e fl elip S id h b r un saidmfitalum fi c f fopposite endwall andadjacen't saidyarehed ceilingvvhe'resaidi 'iialpe'passingth o gh iaid 'R UQGKSs j n alls ifl; i by 'saidflames-are turbulently mixed to produce famaxi- J PP Y 5 ?n m t ns ppo nag s ous l f d lfl jmuni iunif orm high tempemurelrhrbd ndm; said heating" s der units o m ai e; means duptd t Lpor'tionof saidfic'hamberjand a manually controlled valve inject at' iiigh p'ressure a relatively 'fixed, inactiyejgas eousf e loejatedfin 'Vs'aid main 'fuel supply anew simultaneously cmedium intocthe center of s -aidflamej means adapted to a control passageofrfuel from the main supply tobothlsaid 'surri'iund said flame with an 'en'velope' composed of upply 1 5 other gaseous medium; f single manuallygoparable i valye V means to set and simultaneously control the supply of fuel from the main supply to both burner units; means separate from said fuel valve means to simultaneously control supply of said combustion supporting gaseous medium to both said units; and means to adjust said burner units whereby each directs an elongated flame into said chamber from oppositefends, to contact the adjacent side walls near the opposite 'end wall and adjacent said arched ceiling whereby the heating media injected into said fur- References Cited in the file of this patent nace is turbulently mixed whereby a maximum uniform 10 214861070 high temperature is produced around said metal to be treated in said furnace.

' UNITED STATES PATENTS Burin Oct. 17, 1899 Halley Aug. 19, 1902 Regan Sept. 26, 1911 Tripp et a1. May 27, 1919 Remmey Sept. 27, 1932. Guthrie Aug. 9, 1949 Smith Oct. 25, 1949 

